Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate

Bisset, Russell N.; Ticknor, Christopher; Kevrekidis, Panos G.

doi:10.1103/PhysRevA.97.023602

Title: Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate

Journal Article · Thu Feb 01 00:00:00 EST 2018 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.97.023602· OSTI ID:1492663

Bisset, Russell N. ^[1];

^[2]; Kevrekidis, Panos G. ^[3]

Univ. di Trento, Povo (Italy). Center and Dipt. di Fisica
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics

For quantum fluids, the role of quantum fluctuations may be significant in several regimes such as when the dimensionality is low, the density is high, the interactions are strong, or for low particle numbers. In this paper, we propose a fundamentally different regime for enhanced quantum fluctuations without being restricted by any of the above conditions. Instead, our scheme relies on the engineering of an effective attractive interaction in a dilute, two-component Bose-Einstein condensate (BEC) consisting of thousands of atoms. In such a regime, the quantum spin fluctuations are significantly enhanced (atom bunching with respect to the noninteracting limit) since they act to reduce the interaction energy, a remarkable property given that spin fluctuations are normally suppressed (antibunching) at zero temperature. In contrast to the case of true attractive interactions, our approach is not vulnerable to BEC collapse. Here, we numerically demonstrate that these quantum fluctuations are experimentally accessible by either spin or single-component Bragg spectroscopy, offering a useful platform on which to test beyond-mean-field theories. We also develop a variational model and use it to analytically predict the shift of the immiscibility critical point, finding good agreement with our numerics.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1492663

Alternate ID(s):: OSTI ID: 1419098

Report Number(s):: LA-UR-17-30429

Journal Information:: Physical Review A, Vol. 97, Issue 2; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Correlation effects in the quench-induced phase separation dynamics of a two species ultracold quantum gas Mistakidis, S. I.; Katsimiga, G. C.; Kevrekidis, P. G. New Journal of Physics, Vol. 20, Issue 4 https://doi.org/10.1088/1367-2630/aabc6a	journal	April 2018
Harmonically trapped Bose–Bose mixtures: a quantum Monte Carlo study Cikojević, V.; Markić, L. Vranješ; Boronat, J. New Journal of Physics, Vol. 20, Issue 8 https://doi.org/10.1088/1367-2630/aad6cc	journal	August 2018
Harmonically trapped Bose-Bose mixtures: a quantum Monte Carlo study Cikojevic, V.; Markic, L. Vranjes; Boronat, J. arXiv https://doi.org/10.48550/arxiv.1809.00547	text	January 2018

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